UtilTest.hs

{-
Copyright © 2018 Albert Krewinkel

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-}
{-| Tests for utility types and functions
-}
module Foreign.Lua.UtilTest (tests) where

import Foreign.Lua
import Test.Tasty (TestTree, testGroup)
import Test.Tasty.HUnit (assertEqual, testCase)

-- | Specifications for Attributes parsing functions.
tests :: TestTree
tests = testGroup "Utilities"
  [ testCase "Optional return the value if it exists" . runLua $ do
      push "Moin"
      liftIO . assertEqual "Optional value should equal pushed value" (Just "Moin")
        =<< fmap fromOptional (peek stackTop)

  , testCase "Optional can deal with missing values" . runLua $ do
      pushnil
      liftIO . assertEqual "Peeking nil should return Nothing" Nothing
        =<< fmap fromOptional (peek stackTop :: Lua (Optional String))
      liftIO . assertEqual "Inexistant indices should be accepted" Nothing
        =<< fmap fromOptional (peek (nthFromBottom 9) :: Lua (Optional String))

  , testCase "raiseError causes a Lua error" $ do
      let msg = "error message"
      let luaOp = do
            pushHaskellFunction (raiseError msg)
            wrapHaskellFunction
            call 0 0
            return ()
      assertEqual "An error should be raised" (Left (LuaException msg))
        =<< runLuaEither luaOp
  ]